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https://issues.apache.org/jira/browse/HDFS-3704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482458#comment-13482458
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nkeywal commented on HDFS-3704:
-------------------------------
The dead note list exists already, but is used only when it's a read error, not
a call to the ipc interface to get the file length. The existing algo takes
into account transient errors: the dead nodes list is cleared if there is no
remaining node available. However, today, as we don't take into account the
initial ipc call, we're doing two successive tries to the same suspicious node
instead of trying one of the others.
> In the DFSClient, Add the node to the dead list when the ipc.Client calls
> fails
> -------------------------------------------------------------------------------
>
> Key: HDFS-3704
> URL: https://issues.apache.org/jira/browse/HDFS-3704
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 1.0.3, 2.0.0-alpha
> Reporter: nkeywal
> Priority: Minor
> Attachments: HADOOP-3704.patch, HADOOP-3704.patch
>
>
> The DFSCLient maintains a list of dead node per input steam. When creating
> this DFSInputStream, it may connect to one of the nodes to check final block
> size. If this call fail, this datanode should be put in the dead nodes list
> to save time. If not it will be retried for the block transfer during the
> read, and we're likely to get a timeout.
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